<template>
   <div>
      <!-- 面包屑导航区区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>数据统计</el-breadcrumb-item>
         <el-breadcrumb-item>数据报表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区 -->
      <el-card>
         <!-- 2 为Echarts准备一个具备大小 宽高的Dom -->
         <div id="main" style="width: 1200px;height:600px;"></div>
      </el-card>
   </div>
</template>

<script>
import * as echarts from 'echarts'
import _ from 'lodash'

export default {
   data() {
      return {
         // 需要合并的对象
         options: {
            title: {
               text: '用户来源'
            },
            tooltip: {
               trigger: 'axis',
               axisPointer: {
                  type: 'cross',
                  label: {
                     backgroundColor: '#E9EEF3'
                  }
               }
            },
            grid: {
               left: '3%',
               right: '4%',
               bottom: '3%',
               containLabel: true
            },
            xAxis: [
               {
                  boundaryGap: false
               }
            ],
            yAxis: [
               {
                  type: 'value'
               }
            ]
         }
      }
   },
   created() {

   },
   // 2 此时页面上的元素已经被渲染完毕
   async mounted() {
      // 3 基于准备好的dom,初始化charts实例
      var myChart = echarts.init(document.getElementById('main'));
      const { data: res } = await this.$http.get('reports/type/1')
      if (res.meta.status !== 200) {
         return this.$message.error('获取折线图数据失败!')
      }
      // 4 准备数据和配置项
      const result = _.merge(res.data, this.options)

      // 5 展示数据
      myChart.setOption(result)
   },
}
</script>

<style lang="less" scoped>
</style>